Theming: v7.0.0-alpha.16 no loader is configured for svg nor png

[matheo]

Describe the bug
Previously in v6.x we had a theme.js like this:

import { create } from '@storybook/theming/create';
import brandImage from '../src/assets/logo-sidebar.svg'

export default create({
  base: 'light',
  ...
  brandImage,
});

but with v7-alpha.16 we're getting an error:

ERR! Error: Build failed with 1 error:
ERR! .storybook/theme.js:2:23: ERROR: No loader is configured for ".svg" files: src/assets/logo-sidebar.svg
ERR!     at failureErrorWithLog (node_modules/esbuild/lib/main.js:1605:15)
ERR!     at node_modules/esbuild/lib/main.js:1251:28
ERR!     at runOnEndCallbacks (node_modules/esbuild/lib/main.js:1034:63)
ERR!     at buildResponseToResult (node_modules/esbuild/lib/main.js:1249:7)
ERR!     at node_modules/esbuild/lib/main.js:1358:14
ERR!     at node_modules/esbuild/lib/main.js:666:9
ERR!     at handleIncomingPacket (node_modules/esbuild/lib/main.js:763:9)
ERR!     at Socket.readFromStdout (node_modules/esbuild/lib/main.js:632:7)
ERR!     at Socket.emit (node:events:527:28)
ERR!     at addChunk (node:internal/streams/readable:315:12)

I've tried a png file with no luck.

System

System:
    OS: Linux 5.15 Ubuntu 22.04 LTS 22.04 LTS (Jammy Jellyfish)
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Binaries:
    Node: 16.15.0 - ~/.nvm/versions/node/v16.15.0/bin/node
    Yarn: 1.22.19 - /usr/bin/yarn
    npm: 8.5.5 - ~/.nvm/versions/node/v16.15.0/bin/npm
  Browsers:
    Chrome: 103.0.5060.134
    Firefox: 102.0.1
  npmPackages:
    @storybook/addon-a11y: future => 7.0.0-alpha.16 
    @storybook/addon-essentials: future => 7.0.0-alpha.16 
    @storybook/addon-interactions: future => 7.0.0-alpha.16 
    @storybook/angular: future => 7.0.0-alpha.16 
    @storybook/core-server: future => 7.0.0-alpha.16 
    @storybook/testing-library: 0.0.13 => 0.0.13

[shilman]

Jiminy cricket!! I just released https://github.com/storybookjs/storybook/releases/tag/v7.0.0-alpha.19 containing PR #18857 that references this issue. Upgrade today to the @future NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.